How to jump to a specific line in a file in Bash?

Question

linux

There is a log. It is necessary to go through the entire log and compare the value from the log piece with the value that was a second earlier.
With the help of awk and sed it was not possible to write (I could not reconcile with the loop and setting variables).
Help me please

Answer 1

The question is too vague.
I can assume that it is necessary to find lines in the log where the parameter we need has changed relative to the previous one, for example:

Л="дело1 было утром
дело2 было утром
дело3 было днём
дело4 было днём
дело5 было днём
дело6 было вечером
дело7 было вечером
дело8 было ночью"

Let's say there is a log L and you need to find the lines where the third parameter has changed:
you can even simplify the notation: it will output:

дело1 было утром
дело3 было днём
дело6 было вечером
дело8 было ночью